GestureDetector buildButtonColumn(IconData iconData, String label,
    {Function()? onTab}) {
  var primaryColor = Colors.blue; // 主色
  return GestureDetector(
      onTap: () {
        if (onTab != null) {
          onTab();
        }
      },
      child: Column(
        mainAxisSize: MainAxisSize.min,
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          Icon(iconData, color: primaryColor),
          Container(
            margin: const EdgeInsets.only(top: 8.0),
            child: Text(label,
                style: TextStyle(
                  fontSize: 12.0,
                  color: primaryColor,
                  fontWeight: FontWeight.w400,
                )),
          )
        ],
      ));
}

Widget buttonSection = Container(
  padding: const EdgeInsets.only(left: 32.0, right: 32.0),
  child: Row(
    mainAxisAlignment: MainAxisAlignment.spaceBetween,
    children: [
      buildButtonColumn(Icons.call, "call".toUpperCase(),
          onTab: () => showToast(msg: "call")),
      buildButtonColumn(Icons.near_me, "near_me".toUpperCase(),
          onTab: () => showToast(msg: "near_me")),
      buildButtonColumn(Icons.share, "share".toUpperCase(),
          onTab: () => showToast(msg: "share")),
    ],
  ),
);

mainAxisAlignment: MainAxisAlignment.start

start

mainAxisAlignment: MainAxisAlignment.end

end

mainAxisAlignment: MainAxisAlignment.center

center

mainAxisAlignment: MainAxisAlignment.spaceBetween

spaceBetween

mainAxisAlignment: MainAxisAlignment.spaceAround

spaceAround

mainAxisAlignment: MainAxisAlignment.spaceEvenly

spaceEvenly